Credit: John Wilcox

SECURITY CHECK: A National Guardsman checks people before letting them down Belvidere Street in Boston’s Back Bay yesterday, during heightened security after the Boston Marathon bombing.

Credit: Christopher Evans

Brandon Martinez sings during a Remember Boston interfaith candlelight service at the Paulist Center Boston on Tuesday.

Credit: Ryan Hutton

People gather at the Boston Common band stand during a vigil for the victims of the Marathon bombing. Here people write personal messages on a sign that says "Boston you're our home".

Credit: Christopher Evans

An unidentified couple embrace after a Remember Boston interfaith candlelight service at the Paulist Center Boston on Tuesday.

Credit: Christopher Evans

People pray during a Remember Boston interfaith candlelight service at the Paulist Center Boston on Tuesday.

Credit: Christopher Evans

Young women light candles during a vigil at Garvey Park in Dorchester on Tuesday.

Credit: Christopher Evans

People pray during a Remember Boston interfaith candlelight service at the Paulist Center Boston on Tuesday.

Credit: Christopher Evans

People gather during a candlelight vigil at Garvey Park in Dorchester on Tuesday.

Credit: Christopher Evans

People gather during a candlelight vigil at Garvey Park in Dorchester on Tuesday.

Credit: Christopher Evans

People gather during a candlelight vigil at Garvey Park in Dorchester on Tuesday.

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Tight-lipped federal investigators — under mounting pressure to catch the Boston Marathon bomber — tipped their hand and released details of what they’ve found amid the bloody Boylston Street wreckage in hopes of shaking loose a crucial break that will help crack the case.

“The person who did this is someone’s friend, neighbor or relative,” FBI Special Agent-in-Charge Richard DesLauriers said. “Someone knows who did this. The cooperation of the community will play a crucial role in the investigation.”

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